Columbia County is part of the Augusta, Georgia metropolitan area.
As of the census of 2000, there were 89,288 people, 31,120 households, and 25,362 families residing in the county. The population density was 308 people per square mile (119/km²). There were 33,321 housing units at an average density of 115 per square mile (44/km²). The racial makeup of the county was 82.67% White, 11.21% Black or African American, 0.32% Native American, 3.36% Asian (0.6% of the Asians are of South Asian descent), 0.09% Pacific Islander, 0.80% from other races, and 1.56% from two or more races. 2.59% of the population were Hispanic or Latino of any race.
There were 31,120 households out of which 44.40% had children under the age of 18 living with them, 67.50% were married couples living together, 10.60% had a female householder with no husband present, and 18.50% were non-families. 15.40% of all households were made up of individuals and 5.10% had someone living alone who was 65 years of age or older. The average household size was 2.85 and the average family size was 3.18.
In the county the population was spread out with 29.60% under the age of 18, 7.30% from 18 to 24, 31.00% from 25 to 44, 24.10% from 45 to 64, and 8.00% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 95.60 males. For every 100 females age 18 and over, there were 91.70 males.
The median income for a household in the county was $65,507, and the median income for a family was $72,891. Males had a median income of $45,577 versus $28,190 for females. The per capita income for the county was $24,578. About 4.20% of families and 5.10% of the population were below the poverty line, including 5.60% of those under age 18 and 8.10% of those age 65 or over.